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Texas Instruments SN74V293-15PZA
- Part No.:
- SN74V293-15PZA
- Manufacturer:
- Texas Instruments
- Category:
- FIFOs Memory
- Package:
- 80-LQFP
- Datasheet:
-
SN74V293-15PZA.pdf
- Description:
- IC FIFO SYNC 128KX9 10NS 80LQFP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SN74V293-15PZA from Texas Instruments is a 65536 × 18 / 131072 × 9, 3.3-V CMOS FIFO memory with independent read/write clocks, 166-MHz operation, 6-ns read/write cycle time, and user-selectable ×9/×18 bus sizing-designed for high-throughput data buffering in DSP interfacing, telecommunications backplanes, and video frame synchronization.
For engineers reviewing the SN74V293-15PZA datasheet, SN74V293-15PZA pinout, SN74V293-15PZA application, or SN74V293-15PZA equivalent, key selection criteria include FWFT vs. standard timing mode configuration, programmable almost-empty/full flag offsets, zero-latency retransmit capability, and 5-V-tolerant input compatibility with legacy logic interfaces.
Technical Context
This FIFO implements dual-clock asynchronous architecture with fully independent RCLK and WCLK domains (0–166 MHz), enabling simultaneous read/write without arbitration logic. Its RAM array supports two configurable memory organizations: 65536 × 18 (full-width) or 131072 × 9 (half-width), selected at master reset via IW/OW pins.
Flag generation uses dedicated hardware logic for EF/OR, FF/IR, HF, PAE, and PAF-with PAE/PAF offset registers programmable via serial (FWFT/SI + SEN) or parallel (Dn + WEN) methods. Retransmit functionality resets the read pointer to address zero on RT assertion, with latency mode (zero or normal) set by RM during MRS.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Depth × Width | 65536 × 18 or 131072 × 9 - enables flexible data-width matching between mismatched system buses. |
| Max Clock Frequency | 166 MHz - supports real-time streaming of high-bandwidth data such as uncompressed video or packetized telecom payloads. |
| Read/Write Cycle Time | 6 ns - guarantees sub-10-ns throughput per word under worst-case timing conditions. |
| First-Word Latency | Fixed low latency - delivers first word to outputs within three RCLK cycles in FWFT mode, eliminating startup delay in burst-read systems. |
| Input Voltage Tolerance | 5-V-tolerant inputs - allows direct interface with 5-V TTL/CMOS control logic without level-shifting circuitry. |
| Retransmit Latency Mode | Selectable zero-latency or normal-latency - zero-latency mode places first retransmitted word on Qn at same RCLK edge that asserts RT. |
| Bus Configuration | User-selectable ×9/×18 in/out - supports big-endian/little-endian byte ordering and mixed-width data paths via IW/OW pins. |
Pinout & Package
SN74V293-15PZA is housed in an 80-pin Thin Quad Flat Pack (TQFP) package with exposed thermal pad (PZA suffix), compliant with JEDEC MO-153AC. Pin assignments are validated per TI SCAS669D datasheet Figure 1 and Table 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| MRS | Master Reset Input | Asynchronous initialization of read/write pointers, flags, and all configuration registers (FWFT/SI, IW, OW, BE, RM, PFM, IP). |
| WCLK / RCLK | Independent Clock Inputs | Enable concurrent write and read operations; each clock domain operates up to 166 MHz with no frequency or phase relationship required. |
| WEN / REN | Write/Read Enable Controls | Gate data transfer on respective clock edges; ignored when FIFO is full (FF/IR) or empty (EF/OR). |
| EF/OR, FF/IR, HF, PAE, PAF | Status Flag Outputs | Real-time monitoring of FIFO occupancy: EF/OR (empty/output-ready), FF/IR (full/input-ready), HF (half-full), PAE/PAF (programmable thresholds). |
| D0–D17 / Q0–Q17 | Data I/O Ports | Configurable 9-bit or 18-bit parallel ports; unused bits (e.g., D9–D17 in ×9 mode) must be tied low; Q9–Q17 in ×9 mode are no-connect. |
| OE | Output Enable | 3-state control of Q0–Q17 outputs; high = high-impedance, enabling bus sharing without external buffers. |
| RT | Retransmit Control | Asserted low on rising RCLK edge to reset read pointer to zero; triggers zero-latency retransmit if RM = low during MRS. |
| FWFT/SI | Mode Select / Serial Input | High during MRS enables First-Word Fall-Through timing; post-reset functions as serial input for PAE/PAF offset loading. |
Key Features
| Feature | Design Value |
|---|---|
| Zero-Latency Retransmit | Enables immediate replay of buffered data stream from start address on same RCLK edge that asserts RT-critical for retry protocols and frame reassembly. |
| Programmable Almost-Empty/Full Flags | PAE and PAF thresholds configurable via 8 default offsets or custom values loaded serially/parallel-supports adaptive flow control in variable-rate systems. |
| Flexible Bus Matching | Four ×9/×18 port configurations (×18→×18, ×18→×9, ×9→×18, ×9→×9) via IW/OW pins-eliminates glue logic when bridging DSP EMIF (×16/×32) to peripheral ×9 FIFOs. |
| Big/Little-Endian Data Formatting | BE pin selects byte order during long-word (×18) to short-word (×9) conversion-ensures correct MSB/LSB alignment in multi-protocol video/audio pipelines. |
| Glueless DSP Interface | Native timing and signal mapping for TI 'C6x DSPs via EMIF or XBus-no external address latches, handshaking logic, or clock domain synchronizers required. |
Applications
| Telecom Line Card Buffering | DSP-Based Video Frame Synchronization |
|---|---|
Use Scenario: Buffering ATM or Ethernet packet payloads across clock domains between PHY layer (125 MHz) and switch fabric (100 MHz). IC Role / Device Role / Timing Role: Asynchronous FIFO decoupling element providing depth-matched storage (65536 × 18) and FWFT-mode low-latency output for jitter-free packet forwarding. Use Value: Eliminates packet loss during clock skew events; 6-ns cycle time sustains 166-MHz line rate without backpressure. | Use Scenario: Aligning progressive-scan video frames between camera sensor (148.5 MHz pixel clock) and TI C64x+ DSP (EMIF @ 100 MHz). IC Role / Device Role / Timing Role: High-depth FIFO with ×18→×9 bus sizing and big-endian formatting to match BT.656 YUV422 data packing and DSP memory interface. Use Value: Enables seamless frame capture without frame-dropping; zero-latency retransmit supports real-time preview buffer replay. |
| Backplane Data Aggregation | Industrial Protocol Gateway |
Use Scenario: Consolidating sensor data streams from multiple CAN FD nodes into a single high-speed PCIe endpoint via FPGA. IC Role / Device Role / Timing Role: Deep FIFO acting as burst accumulator with programmable PAF to trigger DMA fetch before overflow; 5-V-tolerant inputs interface directly with industrial-level CAN transceivers. Use Value: Prevents data loss during transient bus congestion; partial reset (PRS) allows mid-operation buffer clearing without reconfiguring timing modes. | Use Scenario: Bridging Modbus RTU (9600 bps) to EtherNet/IP (100 Mbps) in PLC I/O modules requiring deterministic latency. IC Role / Device Role / Timing Role: Dual-clock FIFO with synchronous PAE/PAF flag timing (PFM = high) to generate precise interrupt windows for protocol stack scheduling. Use Value: Guarantees sub-millisecond response to fieldbus events; half-full flag (HF) provides early warning for firmware-driven buffer management. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FIFO memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| IDT72V2105L15PF | 512 × 18 depth, 165-MHz max, 3.3-V only, no 5-V-tolerant inputs | Limited to shallow buffering; lacks FWFT mode and zero-latency retransmit | Choose for cost-sensitive, low-depth applications where bus-matching flexibility is not required. |
| ON Semiconductor NB3N502DG | 16K × 18 depth, 133-MHz max, integrated PLL, no programmable flags | Designed for clock multiplication-not data buffering; lacks PAE/PAF, PRS, and MRS configurability | Use only when clock synthesis is primary requirement; unsuitable as direct FIFO replacement. |
Compared with IDT72V2105L15PF and NB3N502DG, SN74V293-15PZA uniquely combines maximum depth (65536 × 18), 5-V-tolerant inputs, FWFT timing, and zero-latency retransmit-making it the sole option for high-reliability telecom and video systems requiring both capacity and deterministic replay.
Availability
SN74V293-15PZA is available at Aetrix Electronics and suitable for telecom infrastructure, video processing equipment, and industrial protocol gateways requiring stable component supply across extended production lifecycles.
Supply support for SN74V293-15PZA includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and logic solutions, with decades of heritage in high-performance memory and interface ICs.
The SN74V293-15PZA belongs to TI's high-speed FIFO product line, engineered specifically for glueless interfacing with TI C6x DSPs and demanding real-time data buffering applications in networking and digital video.
FAQ
What is the maximum operating frequency of the SN74V293-15PZA?
The SN74V293-15PZA supports a maximum clock frequency of 166 MHz for both read and write operations, verified per TI SCAS669D datasheet Section 6. This enables sustained 166-MHz data throughput with 6-ns read/write cycle time, making SN74V293-15PZA suitable for high-speed DSP and telecom applications where timing margin is critical.
Does the SN74V293-15PZA support 5-V logic inputs?
Yes, the SN74V293-15PZA features 5-V-tolerant inputs, allowing direct connection to 5-V TTL or CMOS control signals without external level shifters. This capability is explicitly specified in the "Features" section of the TI SCAS669D datasheet and applies to all control inputs including WEN, REN, MRS, and FWFT/SI-enhancing interoperability in mixed-voltage systems using SN74V293-15PZA.
How does the First-Word Fall-Through (FWFT) mode work in the SN74V293-15PZA?
In FWFT mode, enabled by asserting FWFT/SI high during master reset, the first word written to an empty SN74V293-15PZA appears on Q0–Q17 after exactly three RCLK rising edges-even without asserting REN. Subsequent words require REN activation. This eliminates startup latency in burst-read applications, a behavior confirmed in SCAS669D Section 1.3 and functional description for SN74V293-15PZA.
Can the SN74V293-15PZA be used to expand memory depth beyond 65536 words?
Yes, the SN74V293-15PZA supports depth expansion via FWFT-mode chaining: connect Q0–Q17 of one device to D0–D17 of the next. The datasheet confirms this requires no external logic, as FWFT timing ensures seamless handoff. This technique scales total buffering capacity linearly while preserving SN74V293-15PZA's 6-ns cycle time and flag signaling integrity across cascaded units.
What is the difference between master reset (MRS) and partial reset (PRS) on the SN74V293-15PZA?
Master reset (MRS) initializes all internal state-including read/write pointers, flags, and configuration registers (IW, OW, BE, RM, PFM)-and requires power-up setup. Partial reset (PRS) resets only pointers and output register while retaining all programmed settings (bus width, timing mode, flag offsets). Both are asynchronous, but PRS enables mid-operation recovery without reconfiguration-verified in SCAS669D Sections 5.5 and 5.6 for SN74V293-15PZA.
SN74V293-15PZA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74V
- Package/Case:
- 80-LQFP
- Packaging:
- Tray
- Product Status:
- Active
- Programmable:
- Not Verified
- Memory Size:
- 1.125M (64K x 18)(128K x 9)
- Function:
- Synchronous
- Data Rate:
- 66.7MHz
- Access Time:
- 10ns
- Voltage - Supply:
- 3.15 V ~ 3.45 V
- Current - Supply (Max):
- 35mA
- Bus Directional:
- Uni-Directional
- Expansion Type:
- Depth, Width
- Programmable Flags Support:
- Yes
- Retransmit Capability:
- Yes
- FWFT Support:
- Yes
- Operating Temperature:
- 0°C ~ 70°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 80-LQFP (14x14)
SN74V293-15PZA FAQ
1.How can I place an order for SN74V293-15PZA through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74V293-15PZA on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for SN74V293-15PZA reliable?
The price and inventory of SN74V293-15PZA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74V293-15PZA is usually 5 days.
3.What payment methods are accepted for SN74V293-15PZA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74V293-15PZA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74V293-15PZA?
SN74V293-15PZA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74V293-15PZA order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for SN74V293-15PZA?
For technical support, including SN74V293-15PZA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74V293-15PZA requirements.
6.How does Aetrix verify that SN74V293-15PZA is sourced from the original manufacturer or authorized distributors?
All SN74V293-15PZA products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SN74V293-15PZA meets industry standards.
7.What is the process for return or replacement of SN74V293-15PZA?
All SN74V293-15PZA units undergo pre-shipment inspection (PSI). If there is an issue with SN74V293-15PZA, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The SN74V293-15PZA part is unused and in its original packaging.
Return procedure for SN74V293-15PZA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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